NBB see NON-BULLETIN BOARD.
PREPAYMENT RISK, in the area of mortgage-backed securities, which are backed by loans on property, is the possibility that home owners will payoff their mortgages early, returning the investor's principal earlier than expected. This typically occurs during a declining interest rate environment, when home owners can refinance at lower rates, leaving investors vulnerable to the risk of reinvestment at lower rates.
NIM is Net Interest Margin.
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